Inclusion Criteria- Adults 60 years of age or younger
- Acute stroke (less than 72 hours from admission)
- Informed Consent as documented by signature (Appendix Informed Consent Form)
- Ability to understand the study information and consent form
Exclusion Criteria- known history of HS
- Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia, etc.
- Medications affecting pupillary response
- History of ocular surgery affecting the pupil